Make AppContext generic

[codecov[bot]]

Codecov Report

Base: 66.98% // Head: 67.11% // Increases project coverage by +0.12% :tada:

Coverage data is based on head (e9fbc61) compared to base (dff500c). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #50 +/- ## ========================================== + Coverage 66.98% 67.11% +0.12% ========================================== Files 19 19 Lines 518 520 +2 Branches 91 91 ========================================== + Hits 347 349 +2 Misses 167 167 Partials 4 4 ``` | Flag | Coverage Δ | | |---|---|---| | integration_tests | `38.46% <100.00%> (+0.23%)` | :arrow_up: | | total | `66.53% <100.00%> (+0.12%)` | :arrow_up: | | unit_tests | `62.11% <100.00%> (+0.14%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/radeklat/delfino/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t) | Coverage Δ | | |---|---|---| | [src/delfino/models/app\_context.py](https://codecov.io/gh/radeklat/delfino/pull/50/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t#diff-c3JjL2RlbGZpbm8vbW9kZWxzL2FwcF9jb250ZXh0LnB5) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t)

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